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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[deliverable/linux.git] / drivers / scsi / scsi_transport_spi.c
1 /*
2 * Parallel SCSI (SPI) transport specific attributes exported to sysfs.
3 *
4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
5 * Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/ctype.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/workqueue.h>
25 #include <linux/blkdev.h>
26 #include <linux/mutex.h>
27 #include <scsi/scsi.h>
28 #include "scsi_priv.h"
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_cmnd.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_transport.h>
34 #include <scsi/scsi_transport_spi.h>
35
36 #define SPI_NUM_ATTRS 14 /* increase this if you add attributes */
37 #define SPI_OTHER_ATTRS 1 /* Increase this if you add "always
38 * on" attributes */
39 #define SPI_HOST_ATTRS 1
40
41 #define SPI_MAX_ECHO_BUFFER_SIZE 4096
42
43 #define DV_LOOPS 3
44 #define DV_TIMEOUT (10*HZ)
45 #define DV_RETRIES 3 /* should only need at most
46 * two cc/ua clears */
47
48 /* Private data accessors (keep these out of the header file) */
49 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
50 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
51
52 struct spi_internal {
53 struct scsi_transport_template t;
54 struct spi_function_template *f;
55 };
56
57 #define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t)
58
59 static const int ppr_to_ps[] = {
60 /* The PPR values 0-6 are reserved, fill them in when
61 * the committee defines them */
62 -1, /* 0x00 */
63 -1, /* 0x01 */
64 -1, /* 0x02 */
65 -1, /* 0x03 */
66 -1, /* 0x04 */
67 -1, /* 0x05 */
68 -1, /* 0x06 */
69 3125, /* 0x07 */
70 6250, /* 0x08 */
71 12500, /* 0x09 */
72 25000, /* 0x0a */
73 30300, /* 0x0b */
74 50000, /* 0x0c */
75 };
76 /* The PPR values at which you calculate the period in ns by multiplying
77 * by 4 */
78 #define SPI_STATIC_PPR 0x0c
79
80 static int sprint_frac(char *dest, int value, int denom)
81 {
82 int frac = value % denom;
83 int result = sprintf(dest, "%d", value / denom);
84
85 if (frac == 0)
86 return result;
87 dest[result++] = '.';
88
89 do {
90 denom /= 10;
91 sprintf(dest + result, "%d", frac / denom);
92 result++;
93 frac %= denom;
94 } while (frac);
95
96 dest[result++] = '\0';
97 return result;
98 }
99
100 static int spi_execute(struct scsi_device *sdev, const void *cmd,
101 enum dma_data_direction dir,
102 void *buffer, unsigned bufflen,
103 struct scsi_sense_hdr *sshdr)
104 {
105 int i, result;
106 unsigned char sense[SCSI_SENSE_BUFFERSIZE];
107
108 for(i = 0; i < DV_RETRIES; i++) {
109 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
110 sense, DV_TIMEOUT, /* retries */ 1,
111 REQ_FAILFAST);
112 if (result & DRIVER_SENSE) {
113 struct scsi_sense_hdr sshdr_tmp;
114 if (!sshdr)
115 sshdr = &sshdr_tmp;
116
117 if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
118 sshdr)
119 && sshdr->sense_key == UNIT_ATTENTION)
120 continue;
121 }
122 break;
123 }
124 return result;
125 }
126
127 static struct {
128 enum spi_signal_type value;
129 char *name;
130 } signal_types[] = {
131 { SPI_SIGNAL_UNKNOWN, "unknown" },
132 { SPI_SIGNAL_SE, "SE" },
133 { SPI_SIGNAL_LVD, "LVD" },
134 { SPI_SIGNAL_HVD, "HVD" },
135 };
136
137 static inline const char *spi_signal_to_string(enum spi_signal_type type)
138 {
139 int i;
140
141 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
142 if (type == signal_types[i].value)
143 return signal_types[i].name;
144 }
145 return NULL;
146 }
147 static inline enum spi_signal_type spi_signal_to_value(const char *name)
148 {
149 int i, len;
150
151 for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
152 len = strlen(signal_types[i].name);
153 if (strncmp(name, signal_types[i].name, len) == 0 &&
154 (name[len] == '\n' || name[len] == '\0'))
155 return signal_types[i].value;
156 }
157 return SPI_SIGNAL_UNKNOWN;
158 }
159
160 static int spi_host_setup(struct transport_container *tc, struct device *dev,
161 struct device *cdev)
162 {
163 struct Scsi_Host *shost = dev_to_shost(dev);
164
165 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
166
167 return 0;
168 }
169
170 static int spi_host_configure(struct transport_container *tc,
171 struct device *dev,
172 struct device *cdev);
173
174 static DECLARE_TRANSPORT_CLASS(spi_host_class,
175 "spi_host",
176 spi_host_setup,
177 NULL,
178 spi_host_configure);
179
180 static int spi_host_match(struct attribute_container *cont,
181 struct device *dev)
182 {
183 struct Scsi_Host *shost;
184
185 if (!scsi_is_host_device(dev))
186 return 0;
187
188 shost = dev_to_shost(dev);
189 if (!shost->transportt || shost->transportt->host_attrs.ac.class
190 != &spi_host_class.class)
191 return 0;
192
193 return &shost->transportt->host_attrs.ac == cont;
194 }
195
196 static int spi_target_configure(struct transport_container *tc,
197 struct device *dev,
198 struct device *cdev);
199
200 static int spi_device_configure(struct transport_container *tc,
201 struct device *dev,
202 struct device *cdev)
203 {
204 struct scsi_device *sdev = to_scsi_device(dev);
205 struct scsi_target *starget = sdev->sdev_target;
206
207 /* Populate the target capability fields with the values
208 * gleaned from the device inquiry */
209
210 spi_support_sync(starget) = scsi_device_sync(sdev);
211 spi_support_wide(starget) = scsi_device_wide(sdev);
212 spi_support_dt(starget) = scsi_device_dt(sdev);
213 spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
214 spi_support_ius(starget) = scsi_device_ius(sdev);
215 spi_support_qas(starget) = scsi_device_qas(sdev);
216
217 return 0;
218 }
219
220 static int spi_setup_transport_attrs(struct transport_container *tc,
221 struct device *dev,
222 struct device *cdev)
223 {
224 struct scsi_target *starget = to_scsi_target(dev);
225
226 spi_period(starget) = -1; /* illegal value */
227 spi_min_period(starget) = 0;
228 spi_offset(starget) = 0; /* async */
229 spi_max_offset(starget) = 255;
230 spi_width(starget) = 0; /* narrow */
231 spi_max_width(starget) = 1;
232 spi_iu(starget) = 0; /* no IU */
233 spi_dt(starget) = 0; /* ST */
234 spi_qas(starget) = 0;
235 spi_wr_flow(starget) = 0;
236 spi_rd_strm(starget) = 0;
237 spi_rti(starget) = 0;
238 spi_pcomp_en(starget) = 0;
239 spi_hold_mcs(starget) = 0;
240 spi_dv_pending(starget) = 0;
241 spi_dv_in_progress(starget) = 0;
242 spi_initial_dv(starget) = 0;
243 mutex_init(&spi_dv_mutex(starget));
244
245 return 0;
246 }
247
248 #define spi_transport_show_simple(field, format_string) \
249 \
250 static ssize_t \
251 show_spi_transport_##field(struct device *dev, \
252 struct device_attribute *attr, char *buf) \
253 { \
254 struct scsi_target *starget = transport_class_to_starget(dev); \
255 struct spi_transport_attrs *tp; \
256 \
257 tp = (struct spi_transport_attrs *)&starget->starget_data; \
258 return snprintf(buf, 20, format_string, tp->field); \
259 }
260
261 #define spi_transport_store_simple(field, format_string) \
262 \
263 static ssize_t \
264 store_spi_transport_##field(struct device *dev, \
265 struct device_attribute *attr, \
266 const char *buf, size_t count) \
267 { \
268 int val; \
269 struct scsi_target *starget = transport_class_to_starget(dev); \
270 struct spi_transport_attrs *tp; \
271 \
272 tp = (struct spi_transport_attrs *)&starget->starget_data; \
273 val = simple_strtoul(buf, NULL, 0); \
274 tp->field = val; \
275 return count; \
276 }
277
278 #define spi_transport_show_function(field, format_string) \
279 \
280 static ssize_t \
281 show_spi_transport_##field(struct device *dev, \
282 struct device_attribute *attr, char *buf) \
283 { \
284 struct scsi_target *starget = transport_class_to_starget(dev); \
285 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
286 struct spi_transport_attrs *tp; \
287 struct spi_internal *i = to_spi_internal(shost->transportt); \
288 tp = (struct spi_transport_attrs *)&starget->starget_data; \
289 if (i->f->get_##field) \
290 i->f->get_##field(starget); \
291 return snprintf(buf, 20, format_string, tp->field); \
292 }
293
294 #define spi_transport_store_function(field, format_string) \
295 static ssize_t \
296 store_spi_transport_##field(struct device *dev, \
297 struct device_attribute *attr, \
298 const char *buf, size_t count) \
299 { \
300 int val; \
301 struct scsi_target *starget = transport_class_to_starget(dev); \
302 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
303 struct spi_internal *i = to_spi_internal(shost->transportt); \
304 \
305 if (!i->f->set_##field) \
306 return -EINVAL; \
307 val = simple_strtoul(buf, NULL, 0); \
308 i->f->set_##field(starget, val); \
309 return count; \
310 }
311
312 #define spi_transport_store_max(field, format_string) \
313 static ssize_t \
314 store_spi_transport_##field(struct device *dev, \
315 struct device_attribute *attr, \
316 const char *buf, size_t count) \
317 { \
318 int val; \
319 struct scsi_target *starget = transport_class_to_starget(dev); \
320 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
321 struct spi_internal *i = to_spi_internal(shost->transportt); \
322 struct spi_transport_attrs *tp \
323 = (struct spi_transport_attrs *)&starget->starget_data; \
324 \
325 if (i->f->set_##field) \
326 return -EINVAL; \
327 val = simple_strtoul(buf, NULL, 0); \
328 if (val > tp->max_##field) \
329 val = tp->max_##field; \
330 i->f->set_##field(starget, val); \
331 return count; \
332 }
333
334 #define spi_transport_rd_attr(field, format_string) \
335 spi_transport_show_function(field, format_string) \
336 spi_transport_store_function(field, format_string) \
337 static DEVICE_ATTR(field, S_IRUGO, \
338 show_spi_transport_##field, \
339 store_spi_transport_##field);
340
341 #define spi_transport_simple_attr(field, format_string) \
342 spi_transport_show_simple(field, format_string) \
343 spi_transport_store_simple(field, format_string) \
344 static DEVICE_ATTR(field, S_IRUGO, \
345 show_spi_transport_##field, \
346 store_spi_transport_##field);
347
348 #define spi_transport_max_attr(field, format_string) \
349 spi_transport_show_function(field, format_string) \
350 spi_transport_store_max(field, format_string) \
351 spi_transport_simple_attr(max_##field, format_string) \
352 static DEVICE_ATTR(field, S_IRUGO, \
353 show_spi_transport_##field, \
354 store_spi_transport_##field);
355
356 /* The Parallel SCSI Tranport Attributes: */
357 spi_transport_max_attr(offset, "%d\n");
358 spi_transport_max_attr(width, "%d\n");
359 spi_transport_rd_attr(iu, "%d\n");
360 spi_transport_rd_attr(dt, "%d\n");
361 spi_transport_rd_attr(qas, "%d\n");
362 spi_transport_rd_attr(wr_flow, "%d\n");
363 spi_transport_rd_attr(rd_strm, "%d\n");
364 spi_transport_rd_attr(rti, "%d\n");
365 spi_transport_rd_attr(pcomp_en, "%d\n");
366 spi_transport_rd_attr(hold_mcs, "%d\n");
367
368 /* we only care about the first child device so we return 1 */
369 static int child_iter(struct device *dev, void *data)
370 {
371 struct scsi_device *sdev = to_scsi_device(dev);
372
373 spi_dv_device(sdev);
374 return 1;
375 }
376
377 static ssize_t
378 store_spi_revalidate(struct device *dev, struct device_attribute *attr,
379 const char *buf, size_t count)
380 {
381 struct scsi_target *starget = transport_class_to_starget(dev);
382
383 device_for_each_child(&starget->dev, NULL, child_iter);
384 return count;
385 }
386 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
387
388 /* Translate the period into ns according to the current spec
389 * for SDTR/PPR messages */
390 static int period_to_str(char *buf, int period)
391 {
392 int len, picosec;
393
394 if (period < 0 || period > 0xff) {
395 picosec = -1;
396 } else if (period <= SPI_STATIC_PPR) {
397 picosec = ppr_to_ps[period];
398 } else {
399 picosec = period * 4000;
400 }
401
402 if (picosec == -1) {
403 len = sprintf(buf, "reserved");
404 } else {
405 len = sprint_frac(buf, picosec, 1000);
406 }
407
408 return len;
409 }
410
411 static ssize_t
412 show_spi_transport_period_helper(char *buf, int period)
413 {
414 int len = period_to_str(buf, period);
415 buf[len++] = '\n';
416 buf[len] = '\0';
417 return len;
418 }
419
420 static ssize_t
421 store_spi_transport_period_helper(struct device *dev, const char *buf,
422 size_t count, int *periodp)
423 {
424 int j, picosec, period = -1;
425 char *endp;
426
427 picosec = simple_strtoul(buf, &endp, 10) * 1000;
428 if (*endp == '.') {
429 int mult = 100;
430 do {
431 endp++;
432 if (!isdigit(*endp))
433 break;
434 picosec += (*endp - '0') * mult;
435 mult /= 10;
436 } while (mult > 0);
437 }
438
439 for (j = 0; j <= SPI_STATIC_PPR; j++) {
440 if (ppr_to_ps[j] < picosec)
441 continue;
442 period = j;
443 break;
444 }
445
446 if (period == -1)
447 period = picosec / 4000;
448
449 if (period > 0xff)
450 period = 0xff;
451
452 *periodp = period;
453
454 return count;
455 }
456
457 static ssize_t
458 show_spi_transport_period(struct device *dev,
459 struct device_attribute *attr, char *buf)
460 {
461 struct scsi_target *starget = transport_class_to_starget(dev);
462 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
463 struct spi_internal *i = to_spi_internal(shost->transportt);
464 struct spi_transport_attrs *tp =
465 (struct spi_transport_attrs *)&starget->starget_data;
466
467 if (i->f->get_period)
468 i->f->get_period(starget);
469
470 return show_spi_transport_period_helper(buf, tp->period);
471 }
472
473 static ssize_t
474 store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
475 const char *buf, size_t count)
476 {
477 struct scsi_target *starget = transport_class_to_starget(cdev);
478 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
479 struct spi_internal *i = to_spi_internal(shost->transportt);
480 struct spi_transport_attrs *tp =
481 (struct spi_transport_attrs *)&starget->starget_data;
482 int period, retval;
483
484 if (!i->f->set_period)
485 return -EINVAL;
486
487 retval = store_spi_transport_period_helper(cdev, buf, count, &period);
488
489 if (period < tp->min_period)
490 period = tp->min_period;
491
492 i->f->set_period(starget, period);
493
494 return retval;
495 }
496
497 static DEVICE_ATTR(period, S_IRUGO,
498 show_spi_transport_period,
499 store_spi_transport_period);
500
501 static ssize_t
502 show_spi_transport_min_period(struct device *cdev,
503 struct device_attribute *attr, char *buf)
504 {
505 struct scsi_target *starget = transport_class_to_starget(cdev);
506 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
507 struct spi_internal *i = to_spi_internal(shost->transportt);
508 struct spi_transport_attrs *tp =
509 (struct spi_transport_attrs *)&starget->starget_data;
510
511 if (!i->f->set_period)
512 return -EINVAL;
513
514 return show_spi_transport_period_helper(buf, tp->min_period);
515 }
516
517 static ssize_t
518 store_spi_transport_min_period(struct device *cdev,
519 struct device_attribute *attr,
520 const char *buf, size_t count)
521 {
522 struct scsi_target *starget = transport_class_to_starget(cdev);
523 struct spi_transport_attrs *tp =
524 (struct spi_transport_attrs *)&starget->starget_data;
525
526 return store_spi_transport_period_helper(cdev, buf, count,
527 &tp->min_period);
528 }
529
530
531 static DEVICE_ATTR(min_period, S_IRUGO,
532 show_spi_transport_min_period,
533 store_spi_transport_min_period);
534
535
536 static ssize_t show_spi_host_signalling(struct device *cdev,
537 struct device_attribute *attr,
538 char *buf)
539 {
540 struct Scsi_Host *shost = transport_class_to_shost(cdev);
541 struct spi_internal *i = to_spi_internal(shost->transportt);
542
543 if (i->f->get_signalling)
544 i->f->get_signalling(shost);
545
546 return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
547 }
548 static ssize_t store_spi_host_signalling(struct device *dev,
549 struct device_attribute *attr,
550 const char *buf, size_t count)
551 {
552 struct Scsi_Host *shost = transport_class_to_shost(dev);
553 struct spi_internal *i = to_spi_internal(shost->transportt);
554 enum spi_signal_type type = spi_signal_to_value(buf);
555
556 if (!i->f->set_signalling)
557 return -EINVAL;
558
559 if (type != SPI_SIGNAL_UNKNOWN)
560 i->f->set_signalling(shost, type);
561
562 return count;
563 }
564 static DEVICE_ATTR(signalling, S_IRUGO,
565 show_spi_host_signalling,
566 store_spi_host_signalling);
567
568 #define DV_SET(x, y) \
569 if(i->f->set_##x) \
570 i->f->set_##x(sdev->sdev_target, y)
571
572 enum spi_compare_returns {
573 SPI_COMPARE_SUCCESS,
574 SPI_COMPARE_FAILURE,
575 SPI_COMPARE_SKIP_TEST,
576 };
577
578
579 /* This is for read/write Domain Validation: If the device supports
580 * an echo buffer, we do read/write tests to it */
581 static enum spi_compare_returns
582 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
583 u8 *ptr, const int retries)
584 {
585 int len = ptr - buffer;
586 int j, k, r, result;
587 unsigned int pattern = 0x0000ffff;
588 struct scsi_sense_hdr sshdr;
589
590 const char spi_write_buffer[] = {
591 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
592 };
593 const char spi_read_buffer[] = {
594 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
595 };
596
597 /* set up the pattern buffer. Doesn't matter if we spill
598 * slightly beyond since that's where the read buffer is */
599 for (j = 0; j < len; ) {
600
601 /* fill the buffer with counting (test a) */
602 for ( ; j < min(len, 32); j++)
603 buffer[j] = j;
604 k = j;
605 /* fill the buffer with alternating words of 0x0 and
606 * 0xffff (test b) */
607 for ( ; j < min(len, k + 32); j += 2) {
608 u16 *word = (u16 *)&buffer[j];
609
610 *word = (j & 0x02) ? 0x0000 : 0xffff;
611 }
612 k = j;
613 /* fill with crosstalk (alternating 0x5555 0xaaa)
614 * (test c) */
615 for ( ; j < min(len, k + 32); j += 2) {
616 u16 *word = (u16 *)&buffer[j];
617
618 *word = (j & 0x02) ? 0x5555 : 0xaaaa;
619 }
620 k = j;
621 /* fill with shifting bits (test d) */
622 for ( ; j < min(len, k + 32); j += 4) {
623 u32 *word = (unsigned int *)&buffer[j];
624 u32 roll = (pattern & 0x80000000) ? 1 : 0;
625
626 *word = pattern;
627 pattern = (pattern << 1) | roll;
628 }
629 /* don't bother with random data (test e) */
630 }
631
632 for (r = 0; r < retries; r++) {
633 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
634 buffer, len, &sshdr);
635 if(result || !scsi_device_online(sdev)) {
636
637 scsi_device_set_state(sdev, SDEV_QUIESCE);
638 if (scsi_sense_valid(&sshdr)
639 && sshdr.sense_key == ILLEGAL_REQUEST
640 /* INVALID FIELD IN CDB */
641 && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
642 /* This would mean that the drive lied
643 * to us about supporting an echo
644 * buffer (unfortunately some Western
645 * Digital drives do precisely this)
646 */
647 return SPI_COMPARE_SKIP_TEST;
648
649
650 sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
651 return SPI_COMPARE_FAILURE;
652 }
653
654 memset(ptr, 0, len);
655 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
656 ptr, len, NULL);
657 scsi_device_set_state(sdev, SDEV_QUIESCE);
658
659 if (memcmp(buffer, ptr, len) != 0)
660 return SPI_COMPARE_FAILURE;
661 }
662 return SPI_COMPARE_SUCCESS;
663 }
664
665 /* This is for the simplest form of Domain Validation: a read test
666 * on the inquiry data from the device */
667 static enum spi_compare_returns
668 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
669 u8 *ptr, const int retries)
670 {
671 int r, result;
672 const int len = sdev->inquiry_len;
673 const char spi_inquiry[] = {
674 INQUIRY, 0, 0, 0, len, 0
675 };
676
677 for (r = 0; r < retries; r++) {
678 memset(ptr, 0, len);
679
680 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
681 ptr, len, NULL);
682
683 if(result || !scsi_device_online(sdev)) {
684 scsi_device_set_state(sdev, SDEV_QUIESCE);
685 return SPI_COMPARE_FAILURE;
686 }
687
688 /* If we don't have the inquiry data already, the
689 * first read gets it */
690 if (ptr == buffer) {
691 ptr += len;
692 --r;
693 continue;
694 }
695
696 if (memcmp(buffer, ptr, len) != 0)
697 /* failure */
698 return SPI_COMPARE_FAILURE;
699 }
700 return SPI_COMPARE_SUCCESS;
701 }
702
703 static enum spi_compare_returns
704 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
705 enum spi_compare_returns
706 (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
707 {
708 struct spi_internal *i = to_spi_internal(sdev->host->transportt);
709 struct scsi_target *starget = sdev->sdev_target;
710 int period = 0, prevperiod = 0;
711 enum spi_compare_returns retval;
712
713
714 for (;;) {
715 int newperiod;
716 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
717
718 if (retval == SPI_COMPARE_SUCCESS
719 || retval == SPI_COMPARE_SKIP_TEST)
720 break;
721
722 /* OK, retrain, fallback */
723 if (i->f->get_iu)
724 i->f->get_iu(starget);
725 if (i->f->get_qas)
726 i->f->get_qas(starget);
727 if (i->f->get_period)
728 i->f->get_period(sdev->sdev_target);
729
730 /* Here's the fallback sequence; first try turning off
731 * IU, then QAS (if we can control them), then finally
732 * fall down the periods */
733 if (i->f->set_iu && spi_iu(starget)) {
734 starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
735 DV_SET(iu, 0);
736 } else if (i->f->set_qas && spi_qas(starget)) {
737 starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
738 DV_SET(qas, 0);
739 } else {
740 newperiod = spi_period(starget);
741 period = newperiod > period ? newperiod : period;
742 if (period < 0x0d)
743 period++;
744 else
745 period += period >> 1;
746
747 if (unlikely(period > 0xff || period == prevperiod)) {
748 /* Total failure; set to async and return */
749 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
750 DV_SET(offset, 0);
751 return SPI_COMPARE_FAILURE;
752 }
753 starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
754 DV_SET(period, period);
755 prevperiod = period;
756 }
757 }
758 return retval;
759 }
760
761 static int
762 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
763 {
764 int l, result;
765
766 /* first off do a test unit ready. This can error out
767 * because of reservations or some other reason. If it
768 * fails, the device won't let us write to the echo buffer
769 * so just return failure */
770
771 const char spi_test_unit_ready[] = {
772 TEST_UNIT_READY, 0, 0, 0, 0, 0
773 };
774
775 const char spi_read_buffer_descriptor[] = {
776 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
777 };
778
779
780 /* We send a set of three TURs to clear any outstanding
781 * unit attention conditions if they exist (Otherwise the
782 * buffer tests won't be happy). If the TUR still fails
783 * (reservation conflict, device not ready, etc) just
784 * skip the write tests */
785 for (l = 0; ; l++) {
786 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
787 NULL, 0, NULL);
788
789 if(result) {
790 if(l >= 3)
791 return 0;
792 } else {
793 /* TUR succeeded */
794 break;
795 }
796 }
797
798 result = spi_execute(sdev, spi_read_buffer_descriptor,
799 DMA_FROM_DEVICE, buffer, 4, NULL);
800
801 if (result)
802 /* Device has no echo buffer */
803 return 0;
804
805 return buffer[3] + ((buffer[2] & 0x1f) << 8);
806 }
807
808 static void
809 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
810 {
811 struct spi_internal *i = to_spi_internal(sdev->host->transportt);
812 struct scsi_target *starget = sdev->sdev_target;
813 struct Scsi_Host *shost = sdev->host;
814 int len = sdev->inquiry_len;
815 int min_period = spi_min_period(starget);
816 int max_width = spi_max_width(starget);
817 /* first set us up for narrow async */
818 DV_SET(offset, 0);
819 DV_SET(width, 0);
820
821 if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
822 != SPI_COMPARE_SUCCESS) {
823 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
824 /* FIXME: should probably offline the device here? */
825 return;
826 }
827
828 if (!scsi_device_wide(sdev)) {
829 spi_max_width(starget) = 0;
830 max_width = 0;
831 }
832
833 /* test width */
834 if (i->f->set_width && max_width) {
835 i->f->set_width(starget, 1);
836
837 if (spi_dv_device_compare_inquiry(sdev, buffer,
838 buffer + len,
839 DV_LOOPS)
840 != SPI_COMPARE_SUCCESS) {
841 starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
842 i->f->set_width(starget, 0);
843 /* Make sure we don't force wide back on by asking
844 * for a transfer period that requires it */
845 max_width = 0;
846 if (min_period < 10)
847 min_period = 10;
848 }
849 }
850
851 if (!i->f->set_period)
852 return;
853
854 /* device can't handle synchronous */
855 if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
856 return;
857
858 /* len == -1 is the signal that we need to ascertain the
859 * presence of an echo buffer before trying to use it. len ==
860 * 0 means we don't have an echo buffer */
861 len = -1;
862
863 retry:
864
865 /* now set up to the maximum */
866 DV_SET(offset, spi_max_offset(starget));
867 DV_SET(period, min_period);
868
869 /* try QAS requests; this should be harmless to set if the
870 * target supports it */
871 if (scsi_device_qas(sdev)) {
872 DV_SET(qas, 1);
873 } else {
874 DV_SET(qas, 0);
875 }
876
877 if (scsi_device_ius(sdev) && min_period < 9) {
878 /* This u320 (or u640). Set IU transfers */
879 DV_SET(iu, 1);
880 /* Then set the optional parameters */
881 DV_SET(rd_strm, 1);
882 DV_SET(wr_flow, 1);
883 DV_SET(rti, 1);
884 if (min_period == 8)
885 DV_SET(pcomp_en, 1);
886 } else {
887 DV_SET(iu, 0);
888 }
889
890 /* now that we've done all this, actually check the bus
891 * signal type (if known). Some devices are stupid on
892 * a SE bus and still claim they can try LVD only settings */
893 if (i->f->get_signalling)
894 i->f->get_signalling(shost);
895 if (spi_signalling(shost) == SPI_SIGNAL_SE ||
896 spi_signalling(shost) == SPI_SIGNAL_HVD ||
897 !scsi_device_dt(sdev)) {
898 DV_SET(dt, 0);
899 } else {
900 DV_SET(dt, 1);
901 }
902 /* set width last because it will pull all the other
903 * parameters down to required values */
904 DV_SET(width, max_width);
905
906 /* Do the read only INQUIRY tests */
907 spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
908 spi_dv_device_compare_inquiry);
909 /* See if we actually managed to negotiate and sustain DT */
910 if (i->f->get_dt)
911 i->f->get_dt(starget);
912
913 /* see if the device has an echo buffer. If it does we can do
914 * the SPI pattern write tests. Because of some broken
915 * devices, we *only* try this on a device that has actually
916 * negotiated DT */
917
918 if (len == -1 && spi_dt(starget))
919 len = spi_dv_device_get_echo_buffer(sdev, buffer);
920
921 if (len <= 0) {
922 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
923 return;
924 }
925
926 if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
927 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
928 len = SPI_MAX_ECHO_BUFFER_SIZE;
929 }
930
931 if (spi_dv_retrain(sdev, buffer, buffer + len,
932 spi_dv_device_echo_buffer)
933 == SPI_COMPARE_SKIP_TEST) {
934 /* OK, the stupid drive can't do a write echo buffer
935 * test after all, fall back to the read tests */
936 len = 0;
937 goto retry;
938 }
939 }
940
941
942 /** spi_dv_device - Do Domain Validation on the device
943 * @sdev: scsi device to validate
944 *
945 * Performs the domain validation on the given device in the
946 * current execution thread. Since DV operations may sleep,
947 * the current thread must have user context. Also no SCSI
948 * related locks that would deadlock I/O issued by the DV may
949 * be held.
950 */
951 void
952 spi_dv_device(struct scsi_device *sdev)
953 {
954 struct scsi_target *starget = sdev->sdev_target;
955 u8 *buffer;
956 const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
957
958 if (unlikely(scsi_device_get(sdev)))
959 return;
960
961 if (unlikely(spi_dv_in_progress(starget)))
962 return;
963 spi_dv_in_progress(starget) = 1;
964
965 buffer = kzalloc(len, GFP_KERNEL);
966
967 if (unlikely(!buffer))
968 goto out_put;
969
970 /* We need to verify that the actual device will quiesce; the
971 * later target quiesce is just a nice to have */
972 if (unlikely(scsi_device_quiesce(sdev)))
973 goto out_free;
974
975 scsi_target_quiesce(starget);
976
977 spi_dv_pending(starget) = 1;
978 mutex_lock(&spi_dv_mutex(starget));
979
980 starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
981
982 spi_dv_device_internal(sdev, buffer);
983
984 starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
985
986 mutex_unlock(&spi_dv_mutex(starget));
987 spi_dv_pending(starget) = 0;
988
989 scsi_target_resume(starget);
990
991 spi_initial_dv(starget) = 1;
992
993 out_free:
994 kfree(buffer);
995 out_put:
996 spi_dv_in_progress(starget) = 0;
997 scsi_device_put(sdev);
998 }
999 EXPORT_SYMBOL(spi_dv_device);
1000
1001 struct work_queue_wrapper {
1002 struct work_struct work;
1003 struct scsi_device *sdev;
1004 };
1005
1006 static void
1007 spi_dv_device_work_wrapper(struct work_struct *work)
1008 {
1009 struct work_queue_wrapper *wqw =
1010 container_of(work, struct work_queue_wrapper, work);
1011 struct scsi_device *sdev = wqw->sdev;
1012
1013 kfree(wqw);
1014 spi_dv_device(sdev);
1015 spi_dv_pending(sdev->sdev_target) = 0;
1016 scsi_device_put(sdev);
1017 }
1018
1019
1020 /**
1021 * spi_schedule_dv_device - schedule domain validation to occur on the device
1022 * @sdev: The device to validate
1023 *
1024 * Identical to spi_dv_device() above, except that the DV will be
1025 * scheduled to occur in a workqueue later. All memory allocations
1026 * are atomic, so may be called from any context including those holding
1027 * SCSI locks.
1028 */
1029 void
1030 spi_schedule_dv_device(struct scsi_device *sdev)
1031 {
1032 struct work_queue_wrapper *wqw =
1033 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1034
1035 if (unlikely(!wqw))
1036 return;
1037
1038 if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1039 kfree(wqw);
1040 return;
1041 }
1042 /* Set pending early (dv_device doesn't check it, only sets it) */
1043 spi_dv_pending(sdev->sdev_target) = 1;
1044 if (unlikely(scsi_device_get(sdev))) {
1045 kfree(wqw);
1046 spi_dv_pending(sdev->sdev_target) = 0;
1047 return;
1048 }
1049
1050 INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1051 wqw->sdev = sdev;
1052
1053 schedule_work(&wqw->work);
1054 }
1055 EXPORT_SYMBOL(spi_schedule_dv_device);
1056
1057 /**
1058 * spi_display_xfer_agreement - Print the current target transfer agreement
1059 * @starget: The target for which to display the agreement
1060 *
1061 * Each SPI port is required to maintain a transfer agreement for each
1062 * other port on the bus. This function prints a one-line summary of
1063 * the current agreement; more detailed information is available in sysfs.
1064 */
1065 void spi_display_xfer_agreement(struct scsi_target *starget)
1066 {
1067 struct spi_transport_attrs *tp;
1068 tp = (struct spi_transport_attrs *)&starget->starget_data;
1069
1070 if (tp->offset > 0 && tp->period > 0) {
1071 unsigned int picosec, kb100;
1072 char *scsi = "FAST-?";
1073 char tmp[8];
1074
1075 if (tp->period <= SPI_STATIC_PPR) {
1076 picosec = ppr_to_ps[tp->period];
1077 switch (tp->period) {
1078 case 7: scsi = "FAST-320"; break;
1079 case 8: scsi = "FAST-160"; break;
1080 case 9: scsi = "FAST-80"; break;
1081 case 10:
1082 case 11: scsi = "FAST-40"; break;
1083 case 12: scsi = "FAST-20"; break;
1084 }
1085 } else {
1086 picosec = tp->period * 4000;
1087 if (tp->period < 25)
1088 scsi = "FAST-20";
1089 else if (tp->period < 50)
1090 scsi = "FAST-10";
1091 else
1092 scsi = "FAST-5";
1093 }
1094
1095 kb100 = (10000000 + picosec / 2) / picosec;
1096 if (tp->width)
1097 kb100 *= 2;
1098 sprint_frac(tmp, picosec, 1000);
1099
1100 dev_info(&starget->dev,
1101 "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1102 scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1103 tp->dt ? "DT" : "ST",
1104 tp->iu ? " IU" : "",
1105 tp->qas ? " QAS" : "",
1106 tp->rd_strm ? " RDSTRM" : "",
1107 tp->rti ? " RTI" : "",
1108 tp->wr_flow ? " WRFLOW" : "",
1109 tp->pcomp_en ? " PCOMP" : "",
1110 tp->hold_mcs ? " HMCS" : "",
1111 tmp, tp->offset);
1112 } else {
1113 dev_info(&starget->dev, "%sasynchronous\n",
1114 tp->width ? "wide " : "");
1115 }
1116 }
1117 EXPORT_SYMBOL(spi_display_xfer_agreement);
1118
1119 int spi_populate_width_msg(unsigned char *msg, int width)
1120 {
1121 msg[0] = EXTENDED_MESSAGE;
1122 msg[1] = 2;
1123 msg[2] = EXTENDED_WDTR;
1124 msg[3] = width;
1125 return 4;
1126 }
1127 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1128
1129 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1130 {
1131 msg[0] = EXTENDED_MESSAGE;
1132 msg[1] = 3;
1133 msg[2] = EXTENDED_SDTR;
1134 msg[3] = period;
1135 msg[4] = offset;
1136 return 5;
1137 }
1138 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1139
1140 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1141 int width, int options)
1142 {
1143 msg[0] = EXTENDED_MESSAGE;
1144 msg[1] = 6;
1145 msg[2] = EXTENDED_PPR;
1146 msg[3] = period;
1147 msg[4] = 0;
1148 msg[5] = offset;
1149 msg[6] = width;
1150 msg[7] = options;
1151 return 8;
1152 }
1153 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1154
1155 #ifdef CONFIG_SCSI_CONSTANTS
1156 static const char * const one_byte_msgs[] = {
1157 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1158 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1159 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1160 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1161 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1162 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1163 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1164 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1165 };
1166
1167 static const char * const two_byte_msgs[] = {
1168 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1169 /* 0x23 */ "Ignore Wide Residue", "ACA"
1170 };
1171
1172 static const char * const extended_msgs[] = {
1173 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1174 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1175 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1176 };
1177
1178 static void print_nego(const unsigned char *msg, int per, int off, int width)
1179 {
1180 if (per) {
1181 char buf[20];
1182 period_to_str(buf, msg[per]);
1183 printk("period = %s ns ", buf);
1184 }
1185
1186 if (off)
1187 printk("offset = %d ", msg[off]);
1188 if (width)
1189 printk("width = %d ", 8 << msg[width]);
1190 }
1191
1192 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1193 {
1194 int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1195 msg[msb+3];
1196 printk("%s = %d ", desc, ptr);
1197 }
1198
1199 int spi_print_msg(const unsigned char *msg)
1200 {
1201 int len = 1, i;
1202 if (msg[0] == EXTENDED_MESSAGE) {
1203 len = 2 + msg[1];
1204 if (len == 2)
1205 len += 256;
1206 if (msg[2] < ARRAY_SIZE(extended_msgs))
1207 printk ("%s ", extended_msgs[msg[2]]);
1208 else
1209 printk ("Extended Message, reserved code (0x%02x) ",
1210 (int) msg[2]);
1211 switch (msg[2]) {
1212 case EXTENDED_MODIFY_DATA_POINTER:
1213 print_ptr(msg, 3, "pointer");
1214 break;
1215 case EXTENDED_SDTR:
1216 print_nego(msg, 3, 4, 0);
1217 break;
1218 case EXTENDED_WDTR:
1219 print_nego(msg, 0, 0, 3);
1220 break;
1221 case EXTENDED_PPR:
1222 print_nego(msg, 3, 5, 6);
1223 break;
1224 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1225 print_ptr(msg, 3, "out");
1226 print_ptr(msg, 7, "in");
1227 break;
1228 default:
1229 for (i = 2; i < len; ++i)
1230 printk("%02x ", msg[i]);
1231 }
1232 /* Identify */
1233 } else if (msg[0] & 0x80) {
1234 printk("Identify disconnect %sallowed %s %d ",
1235 (msg[0] & 0x40) ? "" : "not ",
1236 (msg[0] & 0x20) ? "target routine" : "lun",
1237 msg[0] & 0x7);
1238 /* Normal One byte */
1239 } else if (msg[0] < 0x1f) {
1240 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1241 printk("%s ", one_byte_msgs[msg[0]]);
1242 else
1243 printk("reserved (%02x) ", msg[0]);
1244 } else if (msg[0] == 0x55) {
1245 printk("QAS Request ");
1246 /* Two byte */
1247 } else if (msg[0] <= 0x2f) {
1248 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1249 printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1250 msg[1]);
1251 else
1252 printk("reserved two byte (%02x %02x) ",
1253 msg[0], msg[1]);
1254 len = 2;
1255 } else
1256 printk("reserved ");
1257 return len;
1258 }
1259 EXPORT_SYMBOL(spi_print_msg);
1260
1261 #else /* ifndef CONFIG_SCSI_CONSTANTS */
1262
1263 int spi_print_msg(const unsigned char *msg)
1264 {
1265 int len = 1, i;
1266
1267 if (msg[0] == EXTENDED_MESSAGE) {
1268 len = 2 + msg[1];
1269 if (len == 2)
1270 len += 256;
1271 for (i = 0; i < len; ++i)
1272 printk("%02x ", msg[i]);
1273 /* Identify */
1274 } else if (msg[0] & 0x80) {
1275 printk("%02x ", msg[0]);
1276 /* Normal One byte */
1277 } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1278 printk("%02x ", msg[0]);
1279 /* Two byte */
1280 } else if (msg[0] <= 0x2f) {
1281 printk("%02x %02x", msg[0], msg[1]);
1282 len = 2;
1283 } else
1284 printk("%02x ", msg[0]);
1285 return len;
1286 }
1287 EXPORT_SYMBOL(spi_print_msg);
1288 #endif /* ! CONFIG_SCSI_CONSTANTS */
1289
1290 static int spi_device_match(struct attribute_container *cont,
1291 struct device *dev)
1292 {
1293 struct scsi_device *sdev;
1294 struct Scsi_Host *shost;
1295 struct spi_internal *i;
1296
1297 if (!scsi_is_sdev_device(dev))
1298 return 0;
1299
1300 sdev = to_scsi_device(dev);
1301 shost = sdev->host;
1302 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1303 != &spi_host_class.class)
1304 return 0;
1305 /* Note: this class has no device attributes, so it has
1306 * no per-HBA allocation and thus we don't need to distinguish
1307 * the attribute containers for the device */
1308 i = to_spi_internal(shost->transportt);
1309 if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1310 return 0;
1311 return 1;
1312 }
1313
1314 static int spi_target_match(struct attribute_container *cont,
1315 struct device *dev)
1316 {
1317 struct Scsi_Host *shost;
1318 struct scsi_target *starget;
1319 struct spi_internal *i;
1320
1321 if (!scsi_is_target_device(dev))
1322 return 0;
1323
1324 shost = dev_to_shost(dev->parent);
1325 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1326 != &spi_host_class.class)
1327 return 0;
1328
1329 i = to_spi_internal(shost->transportt);
1330 starget = to_scsi_target(dev);
1331
1332 if (i->f->deny_binding && i->f->deny_binding(starget))
1333 return 0;
1334
1335 return &i->t.target_attrs.ac == cont;
1336 }
1337
1338 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1339 "spi_transport",
1340 spi_setup_transport_attrs,
1341 NULL,
1342 spi_target_configure);
1343
1344 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1345 spi_device_match,
1346 spi_device_configure);
1347
1348 static struct attribute *host_attributes[] = {
1349 &dev_attr_signalling.attr,
1350 NULL
1351 };
1352
1353 static struct attribute_group host_attribute_group = {
1354 .attrs = host_attributes,
1355 };
1356
1357 static int spi_host_configure(struct transport_container *tc,
1358 struct device *dev,
1359 struct device *cdev)
1360 {
1361 struct kobject *kobj = &cdev->kobj;
1362 struct Scsi_Host *shost = transport_class_to_shost(cdev);
1363 struct spi_internal *si = to_spi_internal(shost->transportt);
1364 struct attribute *attr = &dev_attr_signalling.attr;
1365 int rc = 0;
1366
1367 if (si->f->set_signalling)
1368 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1369
1370 return rc;
1371 }
1372
1373 /* returns true if we should be showing the variable. Also
1374 * overloads the return by setting 1<<1 if the attribute should
1375 * be writeable */
1376 #define TARGET_ATTRIBUTE_HELPER(name) \
1377 (si->f->show_##name ? 1 : 0) + \
1378 (si->f->set_##name ? 2 : 0)
1379
1380 static int target_attribute_is_visible(struct kobject *kobj,
1381 struct attribute *attr, int i)
1382 {
1383 struct device *cdev = container_of(kobj, struct device, kobj);
1384 struct scsi_target *starget = transport_class_to_starget(cdev);
1385 struct Scsi_Host *shost = transport_class_to_shost(cdev);
1386 struct spi_internal *si = to_spi_internal(shost->transportt);
1387
1388 if (attr == &dev_attr_period.attr &&
1389 spi_support_sync(starget))
1390 return TARGET_ATTRIBUTE_HELPER(period);
1391 else if (attr == &dev_attr_min_period.attr &&
1392 spi_support_sync(starget))
1393 return TARGET_ATTRIBUTE_HELPER(period);
1394 else if (attr == &dev_attr_offset.attr &&
1395 spi_support_sync(starget))
1396 return TARGET_ATTRIBUTE_HELPER(offset);
1397 else if (attr == &dev_attr_max_offset.attr &&
1398 spi_support_sync(starget))
1399 return TARGET_ATTRIBUTE_HELPER(offset);
1400 else if (attr == &dev_attr_width.attr &&
1401 spi_support_wide(starget))
1402 return TARGET_ATTRIBUTE_HELPER(width);
1403 else if (attr == &dev_attr_max_width.attr &&
1404 spi_support_wide(starget))
1405 return TARGET_ATTRIBUTE_HELPER(width);
1406 else if (attr == &dev_attr_iu.attr &&
1407 spi_support_ius(starget))
1408 return TARGET_ATTRIBUTE_HELPER(iu);
1409 else if (attr == &dev_attr_dt.attr &&
1410 spi_support_dt(starget))
1411 return TARGET_ATTRIBUTE_HELPER(dt);
1412 else if (attr == &dev_attr_qas.attr &&
1413 spi_support_qas(starget))
1414 return TARGET_ATTRIBUTE_HELPER(qas);
1415 else if (attr == &dev_attr_wr_flow.attr &&
1416 spi_support_ius(starget))
1417 return TARGET_ATTRIBUTE_HELPER(wr_flow);
1418 else if (attr == &dev_attr_rd_strm.attr &&
1419 spi_support_ius(starget))
1420 return TARGET_ATTRIBUTE_HELPER(rd_strm);
1421 else if (attr == &dev_attr_rti.attr &&
1422 spi_support_ius(starget))
1423 return TARGET_ATTRIBUTE_HELPER(rti);
1424 else if (attr == &dev_attr_pcomp_en.attr &&
1425 spi_support_ius(starget))
1426 return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1427 else if (attr == &dev_attr_hold_mcs.attr &&
1428 spi_support_ius(starget))
1429 return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1430 else if (attr == &dev_attr_revalidate.attr)
1431 return 1;
1432
1433 return 0;
1434 }
1435
1436 static struct attribute *target_attributes[] = {
1437 &dev_attr_period.attr,
1438 &dev_attr_min_period.attr,
1439 &dev_attr_offset.attr,
1440 &dev_attr_max_offset.attr,
1441 &dev_attr_width.attr,
1442 &dev_attr_max_width.attr,
1443 &dev_attr_iu.attr,
1444 &dev_attr_dt.attr,
1445 &dev_attr_qas.attr,
1446 &dev_attr_wr_flow.attr,
1447 &dev_attr_rd_strm.attr,
1448 &dev_attr_rti.attr,
1449 &dev_attr_pcomp_en.attr,
1450 &dev_attr_hold_mcs.attr,
1451 &dev_attr_revalidate.attr,
1452 NULL
1453 };
1454
1455 static struct attribute_group target_attribute_group = {
1456 .attrs = target_attributes,
1457 .is_visible = target_attribute_is_visible,
1458 };
1459
1460 static int spi_target_configure(struct transport_container *tc,
1461 struct device *dev,
1462 struct device *cdev)
1463 {
1464 struct kobject *kobj = &cdev->kobj;
1465 int i;
1466 struct attribute *attr;
1467 int rc;
1468
1469 for (i = 0; (attr = target_attributes[i]) != NULL; i++) {
1470 int j = target_attribute_group.is_visible(kobj, attr, i);
1471
1472 /* FIXME: as well as returning -EEXIST, which we'd like
1473 * to ignore, sysfs also does a WARN_ON and dumps a trace,
1474 * which is bad, so temporarily, skip attributes that are
1475 * already visible (the revalidate one) */
1476 if (j && attr != &dev_attr_revalidate.attr)
1477 rc = sysfs_add_file_to_group(kobj, attr,
1478 target_attribute_group.name);
1479 /* and make the attribute writeable if we have a set
1480 * function */
1481 if ((j & 1))
1482 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1483 }
1484
1485 return 0;
1486 }
1487
1488 struct scsi_transport_template *
1489 spi_attach_transport(struct spi_function_template *ft)
1490 {
1491 struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1492 GFP_KERNEL);
1493
1494 if (unlikely(!i))
1495 return NULL;
1496
1497 i->t.target_attrs.ac.class = &spi_transport_class.class;
1498 i->t.target_attrs.ac.grp = &target_attribute_group;
1499 i->t.target_attrs.ac.match = spi_target_match;
1500 transport_container_register(&i->t.target_attrs);
1501 i->t.target_size = sizeof(struct spi_transport_attrs);
1502 i->t.host_attrs.ac.class = &spi_host_class.class;
1503 i->t.host_attrs.ac.grp = &host_attribute_group;
1504 i->t.host_attrs.ac.match = spi_host_match;
1505 transport_container_register(&i->t.host_attrs);
1506 i->t.host_size = sizeof(struct spi_host_attrs);
1507 i->f = ft;
1508
1509 return &i->t;
1510 }
1511 EXPORT_SYMBOL(spi_attach_transport);
1512
1513 void spi_release_transport(struct scsi_transport_template *t)
1514 {
1515 struct spi_internal *i = to_spi_internal(t);
1516
1517 transport_container_unregister(&i->t.target_attrs);
1518 transport_container_unregister(&i->t.host_attrs);
1519
1520 kfree(i);
1521 }
1522 EXPORT_SYMBOL(spi_release_transport);
1523
1524 static __init int spi_transport_init(void)
1525 {
1526 int error = transport_class_register(&spi_transport_class);
1527 if (error)
1528 return error;
1529 error = anon_transport_class_register(&spi_device_class);
1530 return transport_class_register(&spi_host_class);
1531 }
1532
1533 static void __exit spi_transport_exit(void)
1534 {
1535 transport_class_unregister(&spi_transport_class);
1536 anon_transport_class_unregister(&spi_device_class);
1537 transport_class_unregister(&spi_host_class);
1538 }
1539
1540 MODULE_AUTHOR("Martin Hicks");
1541 MODULE_DESCRIPTION("SPI Transport Attributes");
1542 MODULE_LICENSE("GPL");
1543
1544 module_init(spi_transport_init);
1545 module_exit(spi_transport_exit);
Linux kernel - Deliverables
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